Wwu_fengguangassets: update all references after moving files to assets/

Repositories (channels)

epkg uses channels to refer to a distribution and version (e.g. debian, ubuntu, alpine, fedora, openeuler, archlinux, conda). Each channel has a default version and one or more repos (e.g. main, community, extra). Mirrors are chosen automatically; the placeholder $mirror in index URLs is replaced by a mirror from assets/mirrors/mirrors.json.

List channels and repos

epkg repo list

Output is a table with columns:

channel — Channel name (and possibly variant, e.g. fedora/rpmfusion).
default version — Default distro version (e.g. 13, 3.23, latest).
repos — Comma-separated repo names (e.g. main,community, Everything).
index_url — Template for the index URL; $mirror, $version, $arch, $repo (and sometimes $conda_arch, $conda_repofile, $app_version, etc.) are substituted.

Example (abbreviated):

--------------------------------------------------------------------------------------------------------------------------------------------
channel              | default version | repos                                         | index_url
--------------------------------------------------------------------------------------------------------------------------------------------
alpine               | 3.23            | community,main                                | $mirror/v$version/$repo/$arch/APKINDEX.tar.gz
archlinux            | latest          | core,multilib,extra                           | $mirror/$repo/os/$arch/$repo.files.tar.gz
archlinux            | latest          | aur                                           | https://aur.archlinux.org/packages-meta-ext-v1.json.gz
conda                | latest          | free,r,main,pro                               | $mirror/pkgs/$repo/$conda_arch/$conda_repofile
conda                | latest          | conda-forge,pytorch,MindSpore                 | $mirror/cloud/$repo/$conda_arch/$conda_repofile
debian               | 13              | Official                                      | $mirror/debian/dists/$version/Release
fedora               | 43              | Everything                                    | $mirror/releases/$version/$repo/$arch/os/repodata/repomd.xml
openeuler            | 25.09           | update,EPOL/update/main,everything,EPOL/main  | $mirror/openEuler-$VERSION/$repo/$arch/repodata/repomd.xml
ubuntu               | 25.10           | Official                                      | $mirror/dists/$version/Release
...
--------------------------------------------------------------------------------------------------------------------------------------------

Using a channel

When you create an environment with -c CHANNEL (e.g. epkg env create myenv -c alpine), that env is bound to that channel and its default version. Package operations (install, update, upgrade, list, search, info) then use the channel’s repos and mirrors.

Metadata is cached under ~/.cache/channels/ (user) or /opt/epkg/cache/channels/ (root). Use epkg update to refresh it.

Adding or changing channels

Common pre-defined channel definitions live in the epkg source tree (e.g. under sources/). To add or change a channel, you need to add or edit the corresponding source config and rebuild or redeploy epkg. The exact format is distribution-specific (YAML, repo definitions, etc.). See the repository and design-notes/repodata.md for details.